Condition responsive mounting for measuring instruments



ooNDITIoN R'soNsIvI; MOUNTING Fon MEASURING INSTRUMENTS Filed Jan. 1,1944 July 27,1948. N L EI'DLEN 2,445,943

, INVENTON JAMES L EDELEN Zwam" ATTORNEY throttle by the use of a Watermanometer.

Patented' July 27, 194s CONDITION RESPONSIVE MOUNTING FOR I MnAsUnINGINSTRUMENTS James L. Edelen, Kirkwood, Mo., assignor to CarterCarburetor Corporation, St. Louis. Mo., a

corporation of Delaware application January I, 1944,` serial No. 516,688t e claims. (ci. 'za-11s) This invention relates to measuring devices ofthe type having relatively large scales over which theindicating elementtravels, and consists particularly in-novel means for automaticallypositioning the indicating parts relative to a Support to facilitateobservationby the operator.

The invention may be used advantageously in a flow machine for testingthe delivery of fuel to internal combustion engine carburetors. Such amachine may be used to compare the rates of .fuel flow through standardand test carburetors under similar conditions of applied` suction andthrottle position. I obtain a very accurate measurement of suctionposterior to the carburetor frame II mounting various measuring scalesI2 for indicating the rate of fuel supply, and a water manometer.generally 'indicated at I3. mounted adjacent anobservation window I4.Scales I2 are located approximately at the eye level Of an Operatorstanding before base Ill, whereas scale l I3, in the position of Figs. 1and 2, extends subthough the range of suction need not vary as widely asengine suction in actual operation, for satisfactory results I find thata variation in the water column of several feet is desirable fora-suiiiciently sensitive suction reading. The suction thus read is, ofcourse, the difference in pressure between atmosphere and a pointposterior to the carburetor throttle. Such a range of manometervariation would make reading thereof by the operator difficult.

Accordingly, it is an object of the present invention to provide ameasuring device including means for bodily moving the device relativeto the operator so as to maintain the indicating element at a convenientobservation point.

A more detailed object is to provide a motor for moving a manometer orothermeter relative to its support, which motor is responsive to thechanges in the forcesor other factors being measured so that theindicating element will remain within a fixed observation area.

These objects and other more detailed objects hereafter appearing areattained by the structure illustrated in the accompanying drawing inwhich Fig. 1 is a, perspective view of a carburetor fiow meter embodyingthe invention.

` further.

stantlally below `this level'. At one side o! the i base there'isprovided a metal pan I5 at the centen of which there is an Ornamentalstand I6 forv mounting a carburetor |1. Fuel is supplied to thecarburetor constant level bowl I8 through :dexible tubing I9 connectedwith the gauges I2 and a fuel pump (not shown). The detailedconstruction of the fuel gauges and pump does not constitute the presentinvention and will not be described Figs. 2 and 3 show the manometer, ordiiferen- -tial iiuid pressure meter, and the means to produce suctionto draw air and fuel through the carburetor. The box 2 I, located withinthe right hand portionof base I0 in Fig. 1, has an upright tube 22,which extends into stand I6, for mount- Fig. 2 is an enlarged view ofthe automatically adjustable Inanometer and associated mechanism, partsbeing sectioned and others being omitted for clearer illustration.

Fig. 3 is a central vertical section through structure in Fig.v 2. A

Fig. 4 is a, horizontal section on line 4-4 of Fig. 2.

Fig. 5 is a view Of a detail of the structure in Fig. 2.

Figs. 6 and 7 are front views of the observation window showing themanometer in different positions. l Y

The flow meter apparatus shown in Fig. 1 is constructed to measuretherate of fuel iiow through the carburetor so as to indicate whetherthe carburetor is functioning properly or not. The apparatus comprisesa, base I0, having an upright the ing carburetor I1 to which isconnected the iiexible fuel line I 9, as in Fig. 1. Suction pump 23,operated by motor'24, is connected to box 2| by a large pipe 25 so asVto evacuate air from the box and induce a flow of air and fuel throughthe carburetor. Adjacent the box there are pro-- vided a pair of uprightanglelbars 26 connected at the top and bottom by bars 21 and 28 to forma rigid `guide frame. Between these bars. there is a third stationaryupright 29 of generally U- section, but with the extremities of its legscurved, as at 3|) to form bearing races.` The manometer carriercomprises, generally, the U-section member 3| extending between angles26 and carries a'central post 32 providedwith metal sheathing 33 lhavingcurved extensions 34 cooperating with complementary curved elements 30to receive bearing balls 35 held in position -by grease packing or othermeans. At the lower end of the carrier are a pair of Wells 36 for themanometer liquid, conveniently water, the wells having top plates 31with openings 38 so that atmospheric` pressure is applied to the surfaceof the liquid.

h Also projecting from box 2| is a T-fitting 39 having :an airbleedopening 40 and connected to a flexible tube 4| which extends betweenframing uprlghts 26 and upwardly along manometer carrier 3|, thenthrough the carrier, as to 42, where it connects with a glass tube 43which extends downwardly along the front of the carrier and acrossobservation Window I4. The T-fltting opens into the box through arestriction 45. VThe front part of carrier 3| is provided with manometerscale markings, as shown in Figs. 6 and '7.

Tube 43, at its lower extremity, extends: later-` ally, as at 44 in bothdirections and Opens into atmospheric wells 36 whichl are, originally,sub- 4 movement in vunison relative to said support past said window,and differential pressure producing means for moving said mounting meansin acl cordance with the value being measured but oppo- A cross shaft 48has bearings `49 secured to the upper portions of uprights 28 and hasdrums 50 and 6I at the extremities thereof. A cord 52 I wound aboutAdrum 6| carries a weight 53 which',4

in turn, is connected by a coiled spring 54 to an adjusting bolt 66 andnut I6 seated against the under surface of a bracket 61 projectingfromthe right hand standard 26. A second cord 58 wound about drum 60 issecured at its lower extremity to a cylinder 69 slidable upon a fixed,hollow stem 60, a fluidtight seal being provided at 6I. Stem 60 connectsat its lower extremity with a tube 62 which opens into box 2l. Thuscylinder 69 and stem 60 form a suction or differential fluid motorresponsive to a lowering of the pressure in box 2l to draw cylinder 59downwardly, rotating shaft 46 against the resistance of weight 53 andspring I4;

A pulley 65, rigid with shaft 4 8, has wound thereupon a flexible strapor cord 66 which extends downwardly along central post 32 of themanometer carrier and is secured to the lower extremity thereof, as at10. Clockwise rotation of pulley 65, under the influence of suctionapplied to cylinder 59, as the motive force, automatically lowers themanometer or meter carrier and manometer bodily so as to bring,different parts of scale I3 behind observation Window I4, l

and maintain the top of the water column within easy range of theoperators vision.

Fig. 6 shows the manometer moved to its uppermost position by weight 53and `spring 54,`as when there is no reduction of pressure in box 2|below atmospheric, and Fig. 7 shows the manometer lowered, as whenrelatively high suction exists in box 2l, so that in bothcases. the topofthe water column is readily observable through observation window I4.

Weight 53 vmay be adjustable and should substantially balance the weightof the manometer carrier, including wells 36 and the supply ofwatertherein. Spring'54 balances the effect of suction on cylinder 59 sothat a graduated action is obtained.

Because of air bleed 40 and restriction 45 in T fitting 39, the suctionin box 2| is substantially reduced in application to the manometer sothat the necessary length ,of the manometer is reduced. The small bleed,however, does not substantially affect the suction applied tothecarburetor through the 4large suction pipe 25. The movement of themanometer is thus proportional to changes in suction, as measured by themanometer.

The principles of the invention, obviously, may be utilized in othertypes of measuring devices where it is desirable to maintain theindicating means or elements approximately in a certain position. Theinvention, as illustrated, maybe modied in various respects as willoccur to those skilled in the art and the exclusive use of allmodifications as come within the scope of the appended claims iscontemplated.

I claim:

1. 'A measuring device comprising a support having an observationwindow, a scale element and an indicating element movable relative tosaid scale element for measuring a value, means mounting said elementsadjacent said window for Number Name Date 1,230,035 Royston June 12.1917 1,468,383 Guy Sept. 18, 1923 1,949,908 Hawk Mar. 6, 1934 Y2,019,886 Bogoslowsky Nov. 5, 1935 2,088,385 Podbielniak July 27, 19372,091,303 Brelsford Aug. 31, 1937 2,112,704 Mackay Mar. 29, 19382,113,436 Williams Apr. 5, 1938 2,144,404 Eden Jan. 17, 1939 2,156,877Simpson et al. May 2, 1939 2,163,873 Gibbons June 27, 1939 2,185,205Linebarger Jan. 2, 1940 2,212,586 Chuy Aug. 27, 1940 2,243,456 DutterMay 27, 1941 FOREIGN PATENTS Number Country Date 632,387 Germany July 7,1936 l sitely from the corresponding movement of said indicating elementrelative to said support so as to maintain said indicating elementreadily observable through said window.

2. A device for measuring differential pressures comprising a supporthaving an observation window,-a manometer movably mounted adjacent vsaidwindow, and a motor responsive to the pres-v sure differential beingmeasured to bodily move said manometer and automatically maintain itsindicating means clearly observable through said window.

3. A device for measuring differential fluid pressures comprising asupport frame having an observation window, a carrier movably mounted onsaid frame, a manometer mounted on said carrier and extending adjacentand beyond said window, and a fluid motor operated bythe fluid pressurebeing measured and connected to said carrier so as to maintain thepressure indicating means of said manometer clearly observable throughsaid window.

4. A device as specified in 'claim'B further in--u cluding meansyieldingly urging said carrier in one direction against said iiuid motorand adjustable to insure proper positioning of the manometer indicatingmeans.

5. A device for testing carburetors comprising a carburetor mountingstand, suction producing 'means for drawing air and fuel through thecar-l buretor, a manometer movably mounted on said stand and arrangedfor measuring suction ap-` plied to the posterior end of the carburetor,said manometer having an extended scale, and a suction motor responsiveto changes in said applied suction for shifting said manometer bodilyrelative to said standso as to maintain the manometer indicator within apredetermined area to facilitate observation thereof.

6. A device as described in claim 5 in which said manometer is mountedso as to be extendable substantially beyond the structural limits ofsaid stand.

JAMES L. EDELEN.

REFERENCES CITED The following references are of record lin they le ofthis patent:

UNITED STATES PATENTS

